Question

I want to remove all special character except +, space and – . How it is possible?

My string is

Äî;a[bRa]Co-Founder MobÄ: [phone]

output:

abRaCo-Founder Mob [phone]

According to Answer below, I update my code but still no success.

NSMutableCharacterSet *special = [NSMutableCharacterSet characterSetWithCharactersInString:@"+ -"];
[special formUnionWithCharacterSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]];


NSString *temp=@"gaurav 1!@#!#@! kant !@#!@#!@#12kestwal ";

NSString *yourString = [temp stringByTrimmingCharactersInSet:special];

NSLog(@"%@",yourString);

I missing anything?

Answer 1

This is an example of how to achieve what you’re trying to do:

#import <Foundation/Foundation.h>

BOOL isWanted(unichar character)
{
    if(character>='a' && character<='z')
        return YES;
    if(character>='A' && character<='Z')
        return YES;
    if(character>='0' && character<='9')
        return YES;
    if(character=='-' || character=='+')
        return YES;
    return NO;
}

int main(int argc, char** argv)
{
    @autoreleasepool
    {
        NSString* string= @"Äî;a[bRa]Co-Founder MobÄ: [phone]";
        NSMutableString* filteredString=[NSMutableString new];
        for(NSUInteger i=0; i<[string length];i++)
        {
            unichar character=[string characterAtIndex: i];
            if(isWanted(character))
                [filteredString appendString: [NSString stringWithFormat: @"%c",character]];
        }
        NSLog(@"%@",filteredString);
    }
    return 0;
}

The isWanted function returns YES if you want to have that character in string.For legibility I didn’t use a lot of logic OR’s but just if’s, you can replace that with an unique if.
Sometimes if watching the documentation takes too much time, you can invent the solution yourself.Many people will disagree, of course a solution with a single line is better, but if you don’t find the right documented method why losing time?